Sofa



FIG. 1 is a perspective view of a sofa showing my new design;

FIG. 2 is a left side elevational view thereof;

FIG. 3 is a front elevational view thereof; and

FIG. 4 is a rear elevational view thereof.

The bottom is plain and unornamented. The right end is a mirror image of the left end shown. 

The ornamental design for a sofa, as shown and described. 